Balanced slide-valve



(No Model.)

- J. CAMPBELL.

BALANCED SLIDE VALVE.

No. 606,119. Patented June 21,1898.

Nrrn STATES ATENT FFlC".

JAMES CAMPBELL, OF MILWAUKEE, YVISCONSIN.

BALANCE-D SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent N 0. 606,1 19, dated June21, 1898.:

Application filed December 10, 1897. Serial No. 661,378. (No model.)

To whom it may concern:

Be it known that 1, JAMES CAMPBELL, of

Milwaukee, in the county of Milwaukee and State of "Wisconsin, haveinvented a new and useful Improvement in Balanced Slide- Valves, ofwhich the following is a description, reference being had to theaccompanying drawings, which are a part of this specithe hollow valve,thence permitting the steam to pass through registering ports in thevalve and steam-chest into the cylinder and the exhaust-steam to passout of the cylinder through another port of the steam-chest, and.

finally from said steam-chest through the exhaust-opening thereof.

In the accompanying drawings, Figure 1 is a longitudinal sectional viewof my invention. Fig. 2 is a plan View of Fig. 1. Fig. 3 isacross-section on the line 3 3 of Fig. 1.

Referring to the drawings, the numeral 4 indicates a fragment of acylinder, and 5 the steam-chest mounted thereon. The bottom of thesteam-chest is provided with ports 6 and 7, leading to the cylinder andwhich alternately admit steam to and exhaust the same from saidcylinder. The steam-chest has leading from its top or any other suitablepoint an exhaust-pipe 8.

The numeral 9 indicates a hollow reciprocable valve. This valve isprovided in its bottom with the ports 10 and 11, which as the valve isreciprocated are alternatelybrought into register with the ports 6 and7. Secured to one end of the cylinder and extending out wardly therefromthrough the end of' the steam-chest is the actuating-rod 12, which isworked and moved in the usual and wellknown manner. From the oppositeend of the valve extends a pipe 13, which is fittedin an opening in saidend of the valve, and consequently leads to the interior of the valve.The opposite end of this pipe extends freely through the end of thestea1n-cl1est and through a stuffing-box'l t. This stuffing-boX isinternally threaded, and to the threaded portion thereof is connected aninlet-pipe 15, into which the pipe 13 freely telescopes.

The 'above being a description of the parts of myinven-tion, itsoperation will now be described.

In the position of the valve shown in the drawings the steam will passthrough the inlet-pipe 15 into the pipe 13, and thence into the valve.From the valve it passes through the registering ports 11 and 7 of thevalve and steam-chest, respectively, and e11- ters the cylinder. Theexhaust-steam on the opposite side of the piston of the cylinder is freeto pass through the port 0 in the bottom of the steam-chest and to flowfrom said steam-chest out through the exhaustpipe 8. As the valve isreciprocated toward the opposite end of the steam-chest the port 10 isbrought into register with the port 6, while the port 7 in the bottom ofthe steamchest is open. The inlet-steam now passes through theregistering ports 10 and 6 into the cylinder and exhausts through theport '7. From this it will be seen that the inlet- -steam is notadmitted at all into the steamchest, and consequently the friction ofthe live steam against the reciprocating valve is obviated. Whateverretardinginfiuencethat may be caused by the live steam within the valveis to a certain extent counteracted by the exhaust-steam flowing intothe steamchest.

While I have herein described my valve as particularly applicable foruse in connection with steam, as the actuating agent, yet I do not wishto be understood as restricting myself to such particular adaptation, asit is obvious that it is equally adapted for use with gas, air, or otherelastic-fluid-actuating agent without departing from the spirit andscope of my invention.

What I claim as my invention is The combination of a chest having portsleading to a cylinder, and also provided with an exhaust-passage, a pipefitted to one end of the chest, a hollow valve located within the chestand provided with ports, one of said ports adapted, when the valve isreciprocated in one direction, to be brought into register with one ofthe ports of the valve-chest leadin g to the cylinder, the other port ofthe valve being closed by the bottom of the chest, and at the same timethe other port of the chest leading to the cylinder being opened to thechest, and, when the valve is reciprocated in the opposite direction,said other port of the valve adapted to be brought into register withthe other port of the chest leading to the cylinder, and the other portof the valve being closed by the bottom of the chest, and at the sametime the other port of the chest leading to the cylinder being opened tosaid chest,the uncovered port of the chest in communication with thecylinder, in each instance, adapted for the passage therethrough of theexhaustactuating agent from the cylinder, which exhaust-actuating agentis free to fill the chest and pass out of the final exhaust-pipe, a pipeleading from one end of the valve, and extending freely through the endof the chest, and telescoping freely in to the pipe connected to the endof said chest, through which latter pipe the inlet-actuating agent isfree to enter and pass into the pipe extending from the valve, andthence through said pipe into the valve for passage through the port ofthe valve which is brought into register with one of the ports of thechest leading to the cylinder, and means for reciprocating the valve. Intestimony whereof I afliX my signature in presence 01' two Witnesses.

JAMES CAMPBELL.

Witnesses:

A. L. Monsnnn, ANNA V, FAUs'r.

